Mathematics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..96...27m&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 96, no. 1-2, Dec. 1989, p. 27-37.
Mathematics
44
Convective Heat Transfer, Earth Atmosphere, Earth Mantle, Geotemperature, Planetary Evolution, Degassing, Geochronology, Mathematical Models, Ocean Bottom
Scientific paper
The thermal history of the earth is investigated using a parameterized model of mantle convection, that includes the effects of volatile exchange between the mantle and the surface reservoir and the softening of the mantle by the dissolved volatiles. The mantle degassing rate is taken to be directly proportional to the rate of seafloor spreading which depends on the mantle heat flow. It is shown that the dependence of the mantle viscosity on the volatile content has important effects on the thermal evolution of planetary interiors and the evolution of planetary atmospheres. Degassing is compensated by an increase in temperature, while regassing is compensated by a decrease in temperature. Reasonable degassing scenarios can account for an early rapid formation of the earth's atmosphere inferred from noble gas abundances.
McGovern Patrick J.
Schubert Gerald
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